Season 10 It's Always Sunny in Philadelphia The series completed its tenth season on March 18, 2015, and is renewed for an eleventh and twelfth season, each to consist of 10 episodes. The eleventh season will premiere on January 6, 2016.It was created by Rob McElhenney, developed with Glenn Howerton and is executive produced and primarily written by McElhenney, Howerton and Charlie Day, all of whom star with Kaitlin Olson and Danny DeVito. The series follows the exploits of "The Gang", a group of self-centered friends who run the Irish bar Paddy's Pub in South Philadelphia.Season 10 It's Always Sunny in Philadelphia is an American television sitcom that premiered on FX on August 4, 2005. It moved to FXX from the ninth season.